<!DOCTYPE html>

<html>
   <head>
	   <meta charset="utf-8" />
	   <title>我的html5水平线标签学习</title>
   </head>
<body>
  <h1>我在水平线上面</h1>
    <hr />
   <h2>我在水平线下面</h2>
</body>
</html>